// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2016 Konstantinos Margaritis <markos@freevec.org>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_PACKET_MATH_ZVECTOR_H
#define EIGEN_PACKET_MATH_ZVECTOR_H

namespace Eigen {

namespace internal {

#ifndef EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD
#define EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD 16
#endif

#ifndef EIGEN_HAS_SINGLE_INSTRUCTION_MADD
#define EIGEN_HAS_SINGLE_INSTRUCTION_MADD
#endif

#ifndef EIGEN_ARCH_DEFAULT_NUMBER_OF_REGISTERS
#define EIGEN_ARCH_DEFAULT_NUMBER_OF_REGISTERS 32
#endif

typedef __vector int Packet4i;
typedef __vector unsigned int Packet4ui;
typedef __vector __bool int Packet4bi;
typedef __vector short int Packet8i;
typedef __vector unsigned char Packet16uc;
typedef __vector double Packet2d;
typedef __vector unsigned long long Packet2ul;
typedef __vector long long Packet2l;

// Z14 has builtin support for float vectors
#if !defined(__ARCH__) || (defined(__ARCH__) && __ARCH__ >= 12)
typedef __vector float Packet4f;
#else
typedef struct
{
	Packet2d v4f[2];
} Packet4f;
#endif

typedef union
{
	numext::int32_t i[4];
	numext::uint32_t ui[4];
	numext::int64_t l[2];
	numext::uint64_t ul[2];
	double d[2];
	float f[4];
	Packet4i v4i;
	Packet4ui v4ui;
	Packet2l v2l;
	Packet2ul v2ul;
	Packet2d v2d;
#if !defined(__ARCH__) || (defined(__ARCH__) && __ARCH__ >= 12)
	Packet4f v4f;
#endif
} Packet;

// We don't want to write the same code all the time, but we need to reuse the constants
// and it doesn't really work to declare them global, so we define macros instead

#define _EIGEN_DECLARE_CONST_FAST_Packet4i(NAME, X) Packet4i p4i_##NAME = reinterpret_cast<Packet4i>(vec_splat_s32(X))

#define _EIGEN_DECLARE_CONST_FAST_Packet2d(NAME, X) Packet2d p2d_##NAME = reinterpret_cast<Packet2d>(vec_splat_s64(X))

#define _EIGEN_DECLARE_CONST_FAST_Packet2l(NAME, X) Packet2l p2l_##NAME = reinterpret_cast<Packet2l>(vec_splat_s64(X))

#define _EIGEN_DECLARE_CONST_Packet4i(NAME, X) Packet4i p4i_##NAME = pset1<Packet4i>(X)

#define _EIGEN_DECLARE_CONST_Packet2d(NAME, X) Packet2d p2d_##NAME = pset1<Packet2d>(X)

#define _EIGEN_DECLARE_CONST_Packet2l(NAME, X) Packet2l p2l_##NAME = pset1<Packet2l>(X)

// These constants are endian-agnostic
static _EIGEN_DECLARE_CONST_FAST_Packet4i(ZERO, 0); //{ 0, 0, 0, 0,}
static _EIGEN_DECLARE_CONST_FAST_Packet4i(ONE, 1);	//{ 1, 1, 1, 1}

static _EIGEN_DECLARE_CONST_FAST_Packet2d(ZERO, 0);
static _EIGEN_DECLARE_CONST_FAST_Packet2l(ZERO, 0);
static _EIGEN_DECLARE_CONST_FAST_Packet2l(ONE, 1);

static Packet2d p2d_ONE = { 1.0, 1.0 };
static Packet2d p2d_ZERO_ = { numext::bit_cast<double>0x8000000000000000ull),
                              numext::bit_cast<double>0x8000000000000000ull) };

#if !defined(__ARCH__) || (defined(__ARCH__) && __ARCH__ >= 12)
#define _EIGEN_DECLARE_CONST_FAST_Packet4f(NAME, X) Packet4f p4f_##NAME = reinterpret_cast<Packet4f>(vec_splat_s32(X))

#define _EIGEN_DECLARE_CONST_Packet4f(NAME, X) Packet4f p4f_##NAME = pset1<Packet4f>(X)

#define _EIGEN_DECLARE_CONST_Packet4f_FROM_INT(NAME, X)                                                                \
	const Packet4f p4f_##NAME = reinterpret_cast<Packet4f>(pset1<Packet4i>(X))

static _EIGEN_DECLARE_CONST_FAST_Packet4f(ZERO, 0);	   //{ 0.0, 0.0, 0.0, 0.0}
static _EIGEN_DECLARE_CONST_FAST_Packet4i(MINUS1, -1); //{ -1, -1, -1, -1}
static Packet4f p4f_MZERO = { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
#endif

static Packet4i p4i_COUNTDOWN = { 0, 1, 2, 3 };
static Packet4f p4f_COUNTDOWN = { 0.0, 1.0, 2.0, 3.0 };
static Packet2d p2d_COUNTDOWN = reinterpret_cast<Packet2d>(
	vec_sld(reinterpret_cast<Packet16uc>(p2d_ZERO), reinterpret_cast<Packet16uc>(p2d_ONE), 8));

static Packet16uc p16uc_PSET64_HI = { 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7 };
static Packet16uc p16uc_DUPLICATE32_HI = { 0, 1, 2, 3, 0, 1, 2, 3, 4, 5, 6, 7, 4, 5, 6, 7 };

// Mask alignment
#define _EIGEN_MASK_ALIGNMENT 0xfffffffffffffff0

#define _EIGEN_ALIGNED_PTR(x) ((std::ptrdiff_t)(x)&_EIGEN_MASK_ALIGNMENT)

// Handle endianness properly while loading constants
// Define global static constants:

static Packet16uc p16uc_FORWARD = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
static Packet16uc p16uc_REVERSE32 = { 12, 13, 14, 15, 8, 9, 10, 11, 4, 5, 6, 7, 0, 1, 2, 3 };
static Packet16uc p16uc_REVERSE64 = { 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7 };

static Packet16uc p16uc_PSET32_WODD = vec_sld((Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 0),
											  (Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 2),
											  8); //{ 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 };
static Packet16uc p16uc_PSET32_WEVEN = vec_sld(p16uc_DUPLICATE32_HI,
											   (Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 3),
											   8); //{ 4,5,6,7, 4,5,6,7, 12,13,14,15, 12,13,14,15 };
/*static Packet16uc p16uc_HALF64_0_16 = vec_sld((Packet16uc)p4i_ZERO, vec_splat((Packet16uc) vec_abs(p4i_MINUS16), 3),
8);      //{ 0,0,0,0, 0,0,0,0, 16,16,16,16, 16,16,16,16};

static Packet16uc p16uc_PSET64_HI = (Packet16uc) vec_mergeh((Packet4ui)p16uc_PSET32_WODD,
(Packet4ui)p16uc_PSET32_WEVEN);     //{ 0,1,2,3, 4,5,6,7, 0,1,2,3, 4,5,6,7 };*/
static Packet16uc p16uc_PSET64_LO =
	(Packet16uc)vec_mergel((Packet4ui)p16uc_PSET32_WODD,
						   (Packet4ui)p16uc_PSET32_WEVEN); //{ 8,9,10,11, 12,13,14,15, 8,9,10,11, 12,13,14,15 };
/*static Packet16uc p16uc_TRANSPOSE64_HI = vec_add(p16uc_PSET64_HI, p16uc_HALF64_0_16); //{ 0,1,2,3, 4,5,6,7,
16,17,18,19, 20,21,22,23}; static Packet16uc p16uc_TRANSPOSE64_LO = vec_add(p16uc_PSET64_LO, p16uc_HALF64_0_16); //{
8,9,10,11, 12,13,14,15, 24,25,26,27, 28,29,30,31};*/
static Packet16uc p16uc_TRANSPOSE64_HI = { 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 23 };
static Packet16uc p16uc_TRANSPOSE64_LO = { 8, 9, 10, 11, 12, 13, 14, 15, 24, 25, 26, 27, 28, 29, 30, 31 };

static Packet16uc p16uc_COMPLEX32_REV =
	vec_sld(p16uc_REVERSE32, p16uc_REVERSE32, 8); //{ 4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11 };

static Packet16uc p16uc_COMPLEX32_REV2 =
	vec_sld(p16uc_FORWARD, p16uc_FORWARD, 8); //{ 8,9,10,11, 12,13,14,15, 0,1,2,3, 4,5,6,7 };

#if EIGEN_HAS_BUILTIN(__builtin_prefetch) || EIGEN_COMP_GNUC
#define EIGEN_ZVECTOR_PREFETCH(ADDR) __builtin_prefetch(ADDR);
#else
#define EIGEN_ZVECTOR_PREFETCH(ADDR) asm("   pfd [%[addr]]\n" ::[addr] "r"(ADDR) : "cc");
#endif

template<>
struct packet_traits<int> : default_packet_traits
{
	typedef Packet4i type;
	typedef Packet4i half;
	enum
	{
		Vectorizable = 1,
		AlignedOnScalar = 1,
		size = 4,
		HasHalfPacket = 0,

		HasAdd = 1,
		HasSub = 1,
		HasMul = 1,
		HasDiv = 1,
		HasBlend = 1
	};
};

template<>
struct packet_traits<float> : default_packet_traits
{
	typedef Packet4f type;
	typedef Packet4f half;
	enum
	{
		Vectorizable = 1,
		AlignedOnScalar = 1,
		size = 4,
		HasHalfPacket = 0,

		HasAdd = 1,
		HasSub = 1,
		HasMul = 1,
		HasDiv = 1,
		HasMin = 1,
		HasMax = 1,
		HasAbs = 1,
		HasSin = 0,
		HasCos = 0,
		HasLog = 0,
		HasExp = 1,
		HasSqrt = 1,
		HasRsqrt = 1,
		HasTanh = 1,
		HasErf = 1,
		HasRound = 1,
		HasFloor = 1,
		HasCeil = 1,
		HasNegate = 1,
		HasBlend = 1
	};
};

template<>
struct packet_traits<double> : default_packet_traits
{
	typedef Packet2d type;
	typedef Packet2d half;
	enum
	{
		Vectorizable = 1,
		AlignedOnScalar = 1,
		size = 2,
		HasHalfPacket = 1,

		HasAdd = 1,
		HasSub = 1,
		HasMul = 1,
		HasDiv = 1,
		HasMin = 1,
		HasMax = 1,
		HasAbs = 1,
		HasSin = 0,
		HasCos = 0,
		HasLog = 0,
		HasExp = 1,
		HasSqrt = 1,
		HasRsqrt = 1,
		HasRound = 1,
		HasFloor = 1,
		HasCeil = 1,
		HasNegate = 1,
		HasBlend = 1
	};
};

template<>
struct unpacket_traits<Packet4i>
{
	typedef int type;
	enum
	{
		size = 4,
		alignment = Aligned16,
		vectorizable = true,
		masked_load_available = false,
		masked_store_available = false
	};
	typedef Packet4i half;
};
template<>
struct unpacket_traits<Packet4f>
{
	typedef float type;
	enum
	{
		size = 4,
		alignment = Aligned16,
		vectorizable = true,
		masked_load_available = false,
		masked_store_available = false
	};
	typedef Packet4f half;
};
template<>
struct unpacket_traits<Packet2d>
{
	typedef double type;
	enum
	{
		size = 2,
		alignment = Aligned16,
		vectorizable = true,
		masked_load_available = false,
		masked_store_available = false
	};
	typedef Packet2d half;
};

/* Forward declaration */
EIGEN_DEVICE_FUNC inline void
ptranspose(PacketBlock<Packet4f, 4>& kernel);

inline std::ostream&
operator<<(std::ostream& s, const Packet4i& v)
{
	Packet vt;
	vt.v4i = v;
	s << vt.i[0] << ", " << vt.i[1] << ", " << vt.i[2] << ", " << vt.i[3];
	return s;
}

inline std::ostream&
operator<<(std::ostream& s, const Packet4ui& v)
{
	Packet vt;
	vt.v4ui = v;
	s << vt.ui[0] << ", " << vt.ui[1] << ", " << vt.ui[2] << ", " << vt.ui[3];
	return s;
}

inline std::ostream&
operator<<(std::ostream& s, const Packet2l& v)
{
	Packet vt;
	vt.v2l = v;
	s << vt.l[0] << ", " << vt.l[1];
	return s;
}

inline std::ostream&
operator<<(std::ostream& s, const Packet2ul& v)
{
	Packet vt;
	vt.v2ul = v;
	s << vt.ul[0] << ", " << vt.ul[1];
	return s;
}

inline std::ostream&
operator<<(std::ostream& s, const Packet2d& v)
{
	Packet vt;
	vt.v2d = v;
	s << vt.d[0] << ", " << vt.d[1];
	return s;
}

#if !defined(__ARCH__) || (defined(__ARCH__) && __ARCH__ >= 12)
inline std::ostream&
operator<<(std::ostream& s, const Packet4f& v)
{
	Packet vt;
	vt.v4f = v;
	s << vt.f[0] << ", " << vt.f[1] << ", " << vt.f[2] << ", " << vt.f[3];
	return s;
}
#endif

template<>
EIGEN_STRONG_INLINE Packet4i
pload<Packet4i>(const int* from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_LOAD
	Packet* vfrom;
	vfrom = (Packet*)from;
	return vfrom->v4i;
}

template<>
EIGEN_STRONG_INLINE Packet2d
pload<Packet2d>(const double* from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_LOAD
	Packet* vfrom;
	vfrom = (Packet*)from;
	return vfrom->v2d;
}

template<>
EIGEN_STRONG_INLINE void
pstore<int>(int* to, const Packet4i& from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_STORE
	Packet* vto;
	vto = (Packet*)to;
	vto->v4i = from;
}

template<>
EIGEN_STRONG_INLINE void
pstore<double>(double* to, const Packet2d& from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_STORE
	Packet* vto;
	vto = (Packet*)to;
	vto->v2d = from;
}

template<>
EIGEN_STRONG_INLINE Packet4i
pset1<Packet4i>(const int& from)
{
	return vec_splats(from);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pset1<Packet2d>(const double& from)
{
	return vec_splats(from);
}

template<>
EIGEN_STRONG_INLINE void
pbroadcast4<Packet4i>(const int* a, Packet4i& a0, Packet4i& a1, Packet4i& a2, Packet4i& a3)
{
	a3 = pload<Packet4i>(a);
	a0 = vec_splat(a3, 0);
	a1 = vec_splat(a3, 1);
	a2 = vec_splat(a3, 2);
	a3 = vec_splat(a3, 3);
}

template<>
EIGEN_STRONG_INLINE void
pbroadcast4<Packet2d>(const double* a, Packet2d& a0, Packet2d& a1, Packet2d& a2, Packet2d& a3)
{
	a1 = pload<Packet2d>(a);
	a0 = vec_splat(a1, 0);
	a1 = vec_splat(a1, 1);
	a3 = pload<Packet2d>(a + 2);
	a2 = vec_splat(a3, 0);
	a3 = vec_splat(a3, 1);
}

template<>
EIGEN_DEVICE_FUNC inline Packet4i
pgather<int, Packet4i>(const int* from, Index stride)
{
	int EIGEN_ALIGN16 ai[4];
	ai[0] = from[0 * stride];
	ai[1] = from[1 * stride];
	ai[2] = from[2 * stride];
	ai[3] = from[3 * stride];
	return pload<Packet4i>(ai);
}

template<>
EIGEN_DEVICE_FUNC inline Packet2d
pgather<double, Packet2d>(const double* from, Index stride)
{
	double EIGEN_ALIGN16 af[2];
	af[0] = from[0 * stride];
	af[1] = from[1 * stride];
	return pload<Packet2d>(af);
}

template<>
EIGEN_DEVICE_FUNC inline void
pscatter<int, Packet4i>(int* to, const Packet4i& from, Index stride)
{
	int EIGEN_ALIGN16 ai[4];
	pstore<int>((int*)ai, from);
	to[0 * stride] = ai[0];
	to[1 * stride] = ai[1];
	to[2 * stride] = ai[2];
	to[3 * stride] = ai[3];
}

template<>
EIGEN_DEVICE_FUNC inline void
pscatter<double, Packet2d>(double* to, const Packet2d& from, Index stride)
{
	double EIGEN_ALIGN16 af[2];
	pstore<double>(af, from);
	to[0 * stride] = af[0];
	to[1 * stride] = af[1];
}

template<>
EIGEN_STRONG_INLINE Packet4i
padd<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return (a + b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
padd<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return (a + b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
psub<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return (a - b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
psub<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return (a - b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pmul<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return (a * b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pmul<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return (a * b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pdiv<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return (a / b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pdiv<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return (a / b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pnegate(const Packet4i& a)
{
	return (-a);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pnegate(const Packet2d& a)
{
	return (-a);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pconj(const Packet4i& a)
{
	return a;
}
template<>
EIGEN_STRONG_INLINE Packet2d
pconj(const Packet2d& a)
{
	return a;
}

template<>
EIGEN_STRONG_INLINE Packet4i
pmadd(const Packet4i& a, const Packet4i& b, const Packet4i& c)
{
	return padd<Packet4i>(pmul<Packet4i>(a, b), c);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pmadd(const Packet2d& a, const Packet2d& b, const Packet2d& c)
{
	return vec_madd(a, b, c);
}

template<>
EIGEN_STRONG_INLINE Packet4i
plset<Packet4i>(const int& a)
{
	return padd<Packet4i>(pset1<Packet4i>(a), p4i_COUNTDOWN);
}
template<>
EIGEN_STRONG_INLINE Packet2d
plset<Packet2d>(const double& a)
{
	return padd<Packet2d>(pset1<Packet2d>(a), p2d_COUNTDOWN);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pmin<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return vec_min(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pmin<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return vec_min(a, b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pmax<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return vec_max(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pmax<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return vec_max(a, b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pand<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return vec_and(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pand<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return vec_and(a, b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
por<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return vec_or(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
por<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return vec_or(a, b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pxor<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return vec_xor(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pxor<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return vec_xor(a, b);
}

template<>
EIGEN_STRONG_INLINE Packet4i
pandnot<Packet4i>(const Packet4i& a, const Packet4i& b)
{
	return pand<Packet4i>(a, vec_nor(b, b));
}
template<>
EIGEN_STRONG_INLINE Packet2d
pandnot<Packet2d>(const Packet2d& a, const Packet2d& b)
{
	return vec_and(a, vec_nor(b, b));
}

template<>
EIGEN_STRONG_INLINE Packet2d
pround<Packet2d>(const Packet2d& a)
{
	return vec_round(a);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pceil<Packet2d>(const Packet2d& a)
{
	return vec_ceil(a);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pfloor<Packet2d>(const Packet2d& a)
{
	return vec_floor(a);
}

template<>
EIGEN_STRONG_INLINE Packet4i
ploadu<Packet4i>(const int* from)
{
	return pload<Packet4i>(from);
}
template<>
EIGEN_STRONG_INLINE Packet2d
ploadu<Packet2d>(const double* from)
{
	return pload<Packet2d>(from);
}

template<>
EIGEN_STRONG_INLINE Packet4i
ploaddup<Packet4i>(const int* from)
{
	Packet4i p = pload<Packet4i>(from);
	return vec_perm(p, p, p16uc_DUPLICATE32_HI);
}

template<>
EIGEN_STRONG_INLINE Packet2d
ploaddup<Packet2d>(const double* from)
{
	Packet2d p = pload<Packet2d>(from);
	return vec_perm(p, p, p16uc_PSET64_HI);
}

template<>
EIGEN_STRONG_INLINE void
pstoreu<int>(int* to, const Packet4i& from)
{
	pstore<int>(to, from);
}
template<>
EIGEN_STRONG_INLINE void
pstoreu<double>(double* to, const Packet2d& from)
{
	pstore<double>(to, from);
}

template<>
EIGEN_STRONG_INLINE void
prefetch<int>(const int* addr)
{
	EIGEN_ZVECTOR_PREFETCH(addr);
}
template<>
EIGEN_STRONG_INLINE void
prefetch<double>(const double* addr)
{
	EIGEN_ZVECTOR_PREFETCH(addr);
}

template<>
EIGEN_STRONG_INLINE int
pfirst<Packet4i>(const Packet4i& a)
{
	int EIGEN_ALIGN16 x[4];
	pstore(x, a);
	return x[0];
}
template<>
EIGEN_STRONG_INLINE double
pfirst<Packet2d>(const Packet2d& a)
{
	double EIGEN_ALIGN16 x[2];
	pstore(x, a);
	return x[0];
}

template<>
EIGEN_STRONG_INLINE Packet4i
preverse(const Packet4i& a)
{
	return reinterpret_cast<Packet4i>(
		vec_perm(reinterpret_cast<Packet16uc>(a), reinterpret_cast<Packet16uc>(a), p16uc_REVERSE32));
}

template<>
EIGEN_STRONG_INLINE Packet2d
preverse(const Packet2d& a)
{
	return reinterpret_cast<Packet2d>(
		vec_perm(reinterpret_cast<Packet16uc>(a), reinterpret_cast<Packet16uc>(a), p16uc_REVERSE64));
}

template<>
EIGEN_STRONG_INLINE Packet4i
pabs<Packet4i>(const Packet4i& a)
{
	return vec_abs(a);
}
template<>
EIGEN_STRONG_INLINE Packet2d
pabs<Packet2d>(const Packet2d& a)
{
	return vec_abs(a);
}

template<>
EIGEN_STRONG_INLINE int
predux<Packet4i>(const Packet4i& a)
{
	Packet4i b, sum;
	b = vec_sld(a, a, 8);
	sum = padd<Packet4i>(a, b);
	b = vec_sld(sum, sum, 4);
	sum = padd<Packet4i>(sum, b);
	return pfirst(sum);
}

template<>
EIGEN_STRONG_INLINE double
predux<Packet2d>(const Packet2d& a)
{
	Packet2d b, sum;
	b = reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4i>(a), reinterpret_cast<Packet4i>(a), 8));
	sum = padd<Packet2d>(a, b);
	return pfirst(sum);
}

// Other reduction functions:
// mul
template<>
EIGEN_STRONG_INLINE int
predux_mul<Packet4i>(const Packet4i& a)
{
	EIGEN_ALIGN16 int aux[4];
	pstore(aux, a);
	return aux[0] * aux[1] * aux[2] * aux[3];
}

template<>
EIGEN_STRONG_INLINE double
predux_mul<Packet2d>(const Packet2d& a)
{
	return pfirst(
		pmul(a, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4i>(a), reinterpret_cast<Packet4i>(a), 8))));
}

// min
template<>
EIGEN_STRONG_INLINE int
predux_min<Packet4i>(const Packet4i& a)
{
	Packet4i b, res;
	b = pmin<Packet4i>(a, vec_sld(a, a, 8));
	res = pmin<Packet4i>(b, vec_sld(b, b, 4));
	return pfirst(res);
}

template<>
EIGEN_STRONG_INLINE double
predux_min<Packet2d>(const Packet2d& a)
{
	return pfirst(pmin<Packet2d>(
		a, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4i>(a), reinterpret_cast<Packet4i>(a), 8))));
}

// max
template<>
EIGEN_STRONG_INLINE int
predux_max<Packet4i>(const Packet4i& a)
{
	Packet4i b, res;
	b = pmax<Packet4i>(a, vec_sld(a, a, 8));
	res = pmax<Packet4i>(b, vec_sld(b, b, 4));
	return pfirst(res);
}

// max
template<>
EIGEN_STRONG_INLINE double
predux_max<Packet2d>(const Packet2d& a)
{
	return pfirst(pmax<Packet2d>(
		a, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4i>(a), reinterpret_cast<Packet4i>(a), 8))));
}

EIGEN_DEVICE_FUNC inline void
ptranspose(PacketBlock<Packet4i, 4>& kernel)
{
	Packet4i t0 = vec_mergeh(kernel.packet[0], kernel.packet[2]);
	Packet4i t1 = vec_mergel(kernel.packet[0], kernel.packet[2]);
	Packet4i t2 = vec_mergeh(kernel.packet[1], kernel.packet[3]);
	Packet4i t3 = vec_mergel(kernel.packet[1], kernel.packet[3]);
	kernel.packet[0] = vec_mergeh(t0, t2);
	kernel.packet[1] = vec_mergel(t0, t2);
	kernel.packet[2] = vec_mergeh(t1, t3);
	kernel.packet[3] = vec_mergel(t1, t3);
}

EIGEN_DEVICE_FUNC inline void
ptranspose(PacketBlock<Packet2d, 2>& kernel)
{
	Packet2d t0 = vec_perm(kernel.packet[0], kernel.packet[1], p16uc_TRANSPOSE64_HI);
	Packet2d t1 = vec_perm(kernel.packet[0], kernel.packet[1], p16uc_TRANSPOSE64_LO);
	kernel.packet[0] = t0;
	kernel.packet[1] = t1;
}

template<>
EIGEN_STRONG_INLINE Packet4i
pblend(const Selector<4>& ifPacket, const Packet4i& thenPacket, const Packet4i& elsePacket)
{
	Packet4ui select = { ifPacket.select[0], ifPacket.select[1], ifPacket.select[2], ifPacket.select[3] };
	Packet4ui mask = vec_cmpeq(select, reinterpret_cast<Packet4ui>(p4i_ONE));
	return vec_sel(elsePacket, thenPacket, mask);
}

template<>
EIGEN_STRONG_INLINE Packet2d
pblend(const Selector<2>& ifPacket, const Packet2d& thenPacket, const Packet2d& elsePacket)
{
	Packet2ul select = { ifPacket.select[0], ifPacket.select[1] };
	Packet2ul mask = vec_cmpeq(select, reinterpret_cast<Packet2ul>(p2l_ONE));
	return vec_sel(elsePacket, thenPacket, mask);
}

/* z13 has no vector float support so we emulate that with double
   z14 has proper vector float support.
*/
#if !defined(__ARCH__) || (defined(__ARCH__) && __ARCH__ < 12)
/* Helper function to simulate a vec_splat_packet4f
 */
template<int element>
EIGEN_STRONG_INLINE Packet4f
vec_splat_packet4f(const Packet4f& from)
{
	Packet4f splat;
	switch (element) {
		case 0:
			splat.v4f[0] = vec_splat(from.v4f[0], 0);
			splat.v4f[1] = splat.v4f[0];
			break;
		case 1:
			splat.v4f[0] = vec_splat(from.v4f[0], 1);
			splat.v4f[1] = splat.v4f[0];
			break;
		case 2:
			splat.v4f[0] = vec_splat(from.v4f[1], 0);
			splat.v4f[1] = splat.v4f[0];
			break;
		case 3:
			splat.v4f[0] = vec_splat(from.v4f[1], 1);
			splat.v4f[1] = splat.v4f[0];
			break;
	}
	return splat;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pload<Packet4f>(const float* from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_LOAD
	Packet4f vfrom;
	vfrom.v4f[0] = vec_ld2f(&from[0]);
	vfrom.v4f[1] = vec_ld2f(&from[2]);
	return vfrom;
}

template<>
EIGEN_STRONG_INLINE void
pstore<float>(float* to, const Packet4f& from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_STORE
	vec_st2f(from.v4f[0], &to[0]);
	vec_st2f(from.v4f[1], &to[2]);
}

template<>
EIGEN_STRONG_INLINE Packet4f
pset1<Packet4f>(const float& from)
{
	Packet4f to;
	to.v4f[0] = pset1<Packet2d>(static_cast<const double&>(from));
	to.v4f[1] = to.v4f[0];
	return to;
}

template<>
EIGEN_STRONG_INLINE void
pbroadcast4<Packet4f>(const float* a, Packet4f& a0, Packet4f& a1, Packet4f& a2, Packet4f& a3)
{
	a3 = pload<Packet4f>(a);
	a0 = vec_splat_packet4f<0>(a3);
	a1 = vec_splat_packet4f<1>(a3);
	a2 = vec_splat_packet4f<2>(a3);
	a3 = vec_splat_packet4f<3>(a3);
}

template<>
EIGEN_DEVICE_FUNC inline Packet4f
pgather<float, Packet4f>(const float* from, Index stride)
{
	float EIGEN_ALIGN16 ai[4];
	ai[0] = from[0 * stride];
	ai[1] = from[1 * stride];
	ai[2] = from[2 * stride];
	ai[3] = from[3 * stride];
	return pload<Packet4f>(ai);
}

template<>
EIGEN_DEVICE_FUNC inline void
pscatter<float, Packet4f>(float* to, const Packet4f& from, Index stride)
{
	float EIGEN_ALIGN16 ai[4];
	pstore<float>((float*)ai, from);
	to[0 * stride] = ai[0];
	to[1 * stride] = ai[1];
	to[2 * stride] = ai[2];
	to[3 * stride] = ai[3];
}

template<>
EIGEN_STRONG_INLINE Packet4f
padd<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f c;
	c.v4f[0] = a.v4f[0] + b.v4f[0];
	c.v4f[1] = a.v4f[1] + b.v4f[1];
	return c;
}

template<>
EIGEN_STRONG_INLINE Packet4f
psub<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f c;
	c.v4f[0] = a.v4f[0] - b.v4f[0];
	c.v4f[1] = a.v4f[1] - b.v4f[1];
	return c;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pmul<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f c;
	c.v4f[0] = a.v4f[0] * b.v4f[0];
	c.v4f[1] = a.v4f[1] * b.v4f[1];
	return c;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pdiv<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f c;
	c.v4f[0] = a.v4f[0] / b.v4f[0];
	c.v4f[1] = a.v4f[1] / b.v4f[1];
	return c;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pnegate(const Packet4f& a)
{
	Packet4f c;
	c.v4f[0] = -a.v4f[0];
	c.v4f[1] = -a.v4f[1];
	return c;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pmadd(const Packet4f& a, const Packet4f& b, const Packet4f& c)
{
	Packet4f res;
	res.v4f[0] = vec_madd(a.v4f[0], b.v4f[0], c.v4f[0]);
	res.v4f[1] = vec_madd(a.v4f[1], b.v4f[1], c.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pmin<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pmin(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pmin(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pmax<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pmax(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pmax(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pand<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pand(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pand(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
por<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = por(a.v4f[0], b.v4f[0]);
	res.v4f[1] = por(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pxor<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pxor(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pxor(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pandnot<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pandnot(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pandnot(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pround<Packet4f>(const Packet4f& a)
{
	Packet4f res;
	res.v4f[0] = vec_round(a.v4f[0]);
	res.v4f[1] = vec_round(a.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pceil<Packet4f>(const Packet4f& a)
{
	Packet4f res;
	res.v4f[0] = vec_ceil(a.v4f[0]);
	res.v4f[1] = vec_ceil(a.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pfloor<Packet4f>(const Packet4f& a)
{
	Packet4f res;
	res.v4f[0] = vec_floor(a.v4f[0]);
	res.v4f[1] = vec_floor(a.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE Packet4f
ploaddup<Packet4f>(const float* from)
{
	Packet4f p = pload<Packet4f>(from);
	p.v4f[1] = vec_splat(p.v4f[0], 1);
	p.v4f[0] = vec_splat(p.v4f[0], 0);
	return p;
}

template<>
EIGEN_STRONG_INLINE float
pfirst<Packet4f>(const Packet4f& a)
{
	float EIGEN_ALIGN16 x[2];
	vec_st2f(a.v4f[0], &x[0]);
	return x[0];
}

template<>
EIGEN_STRONG_INLINE Packet4f
preverse(const Packet4f& a)
{
	Packet4f rev;
	rev.v4f[0] = preverse<Packet2d>(a.v4f[1]);
	rev.v4f[1] = preverse<Packet2d>(a.v4f[0]);
	return rev;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pabs<Packet4f>(const Packet4f& a)
{
	Packet4f res;
	res.v4f[0] = pabs(a.v4f[0]);
	res.v4f[1] = pabs(a.v4f[1]);
	return res;
}

template<>
EIGEN_STRONG_INLINE float
predux<Packet4f>(const Packet4f& a)
{
	Packet2d sum;
	sum = padd<Packet2d>(a.v4f[0], a.v4f[1]);
	double first = predux<Packet2d>(sum);
	return static_cast<float>(first);
}

template<>
EIGEN_STRONG_INLINE float
predux_mul<Packet4f>(const Packet4f& a)
{
	// Return predux_mul<Packet2d> of the subvectors product
	return static_cast<float>(pfirst(predux_mul(pmul(a.v4f[0], a.v4f[1]))));
}

template<>
EIGEN_STRONG_INLINE float
predux_min<Packet4f>(const Packet4f& a)
{
	Packet2d b, res;
	b = pmin<Packet2d>(a.v4f[0], a.v4f[1]);
	res = pmin<Packet2d>(
		b, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4i>(b), reinterpret_cast<Packet4i>(b), 8)));
	return static_cast<float>(pfirst(res));
}

template<>
EIGEN_STRONG_INLINE float
predux_max<Packet4f>(const Packet4f& a)
{
	Packet2d b, res;
	b = pmax<Packet2d>(a.v4f[0], a.v4f[1]);
	res = pmax<Packet2d>(
		b, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4i>(b), reinterpret_cast<Packet4i>(b), 8)));
	return static_cast<float>(pfirst(res));
}

/* Split the Packet4f PacketBlock into 4 Packet2d PacketBlocks and transpose each one
 */
EIGEN_DEVICE_FUNC inline void
ptranspose(PacketBlock<Packet4f, 4>& kernel)
{
	PacketBlock<Packet2d, 2> t0, t1, t2, t3;
	// copy top-left 2x2 Packet2d block
	t0.packet[0] = kernel.packet[0].v4f[0];
	t0.packet[1] = kernel.packet[1].v4f[0];

	// copy top-right 2x2 Packet2d block
	t1.packet[0] = kernel.packet[0].v4f[1];
	t1.packet[1] = kernel.packet[1].v4f[1];

	// copy bottom-left 2x2 Packet2d block
	t2.packet[0] = kernel.packet[2].v4f[0];
	t2.packet[1] = kernel.packet[3].v4f[0];

	// copy bottom-right 2x2 Packet2d block
	t3.packet[0] = kernel.packet[2].v4f[1];
	t3.packet[1] = kernel.packet[3].v4f[1];

	// Transpose all 2x2 blocks
	ptranspose(t0);
	ptranspose(t1);
	ptranspose(t2);
	ptranspose(t3);

	// Copy back transposed blocks, but exchange t1 and t2 due to transposition
	kernel.packet[0].v4f[0] = t0.packet[0];
	kernel.packet[0].v4f[1] = t2.packet[0];
	kernel.packet[1].v4f[0] = t0.packet[1];
	kernel.packet[1].v4f[1] = t2.packet[1];
	kernel.packet[2].v4f[0] = t1.packet[0];
	kernel.packet[2].v4f[1] = t3.packet[0];
	kernel.packet[3].v4f[0] = t1.packet[1];
	kernel.packet[3].v4f[1] = t3.packet[1];
}

template<>
EIGEN_STRONG_INLINE Packet4f
pblend(const Selector<4>& ifPacket, const Packet4f& thenPacket, const Packet4f& elsePacket)
{
	Packet2ul select_hi = { ifPacket.select[0], ifPacket.select[1] };
	Packet2ul select_lo = { ifPacket.select[2], ifPacket.select[3] };
	Packet2ul mask_hi = vec_cmpeq(select_hi, reinterpret_cast<Packet2ul>(p2l_ONE));
	Packet2ul mask_lo = vec_cmpeq(select_lo, reinterpret_cast<Packet2ul>(p2l_ONE));
	Packet4f result;
	result.v4f[0] = vec_sel(elsePacket.v4f[0], thenPacket.v4f[0], mask_hi);
	result.v4f[1] = vec_sel(elsePacket.v4f[1], thenPacket.v4f[1], mask_lo);
	return result;
}

template<>
Packet4f EIGEN_STRONG_INLINE
pcmp_le<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pcmp_le(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pcmp_le(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
Packet4f EIGEN_STRONG_INLINE
pcmp_lt<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pcmp_lt(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pcmp_lt(a.v4f[1], b.v4f[1]);
	return res;
}

template<>
Packet4f EIGEN_STRONG_INLINE
pcmp_eq<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	Packet4f res;
	res.v4f[0] = pcmp_eq(a.v4f[0], b.v4f[0]);
	res.v4f[1] = pcmp_eq(a.v4f[1], b.v4f[1]);
	return res;
}

#else
template<>
EIGEN_STRONG_INLINE Packet4f
pload<Packet4f>(const float* from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_LOAD
	Packet* vfrom;
	vfrom = (Packet*)from;
	return vfrom->v4f;
}

template<>
EIGEN_STRONG_INLINE void
pstore<float>(float* to, const Packet4f& from)
{
	// FIXME: No intrinsic yet
	EIGEN_DEBUG_ALIGNED_STORE
	Packet* vto;
	vto = (Packet*)to;
	vto->v4f = from;
}

template<>
EIGEN_STRONG_INLINE Packet4f
pset1<Packet4f>(const float& from)
{
	return vec_splats(from);
}

template<>
EIGEN_STRONG_INLINE void
pbroadcast4<Packet4f>(const float* a, Packet4f& a0, Packet4f& a1, Packet4f& a2, Packet4f& a3)
{
	a3 = pload<Packet4f>(a);
	a0 = vec_splat(a3, 0);
	a1 = vec_splat(a3, 1);
	a2 = vec_splat(a3, 2);
	a3 = vec_splat(a3, 3);
}

template<>
EIGEN_DEVICE_FUNC inline Packet4f
pgather<float, Packet4f>(const float* from, Index stride)
{
	float EIGEN_ALIGN16 af[4];
	af[0] = from[0 * stride];
	af[1] = from[1 * stride];
	af[2] = from[2 * stride];
	af[3] = from[3 * stride];
	return pload<Packet4f>(af);
}

template<>
EIGEN_DEVICE_FUNC inline void
pscatter<float, Packet4f>(float* to, const Packet4f& from, Index stride)
{
	float EIGEN_ALIGN16 af[4];
	pstore<float>((float*)af, from);
	to[0 * stride] = af[0];
	to[1 * stride] = af[1];
	to[2 * stride] = af[2];
	to[3 * stride] = af[3];
}

template<>
EIGEN_STRONG_INLINE Packet4f
padd<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return (a + b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
psub<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return (a - b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pmul<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return (a * b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pdiv<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return (a / b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pnegate<Packet4f>(const Packet4f& a)
{
	return (-a);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pconj<Packet4f>(const Packet4f& a)
{
	return a;
}
template<>
EIGEN_STRONG_INLINE Packet4f
pmadd<Packet4f>(const Packet4f& a, const Packet4f& b, const Packet4f& c)
{
	return vec_madd(a, b, c);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pmin<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return vec_min(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pmax<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return vec_max(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pand<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return vec_and(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
por<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return vec_or(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pxor<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return vec_xor(a, b);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pandnot<Packet4f>(const Packet4f& a, const Packet4f& b)
{
	return vec_and(a, vec_nor(b, b));
}
template<>
EIGEN_STRONG_INLINE Packet4f
pround<Packet4f>(const Packet4f& a)
{
	return vec_round(a);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pceil<Packet4f>(const Packet4f& a)
{
	return vec_ceil(a);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pfloor<Packet4f>(const Packet4f& a)
{
	return vec_floor(a);
}
template<>
EIGEN_STRONG_INLINE Packet4f
pabs<Packet4f>(const Packet4f& a)
{
	return vec_abs(a);
}
template<>
EIGEN_STRONG_INLINE float
pfirst<Packet4f>(const Packet4f& a)
{
	float EIGEN_ALIGN16 x[4];
	pstore(x, a);
	return x[0];
}

template<>
EIGEN_STRONG_INLINE Packet4f
ploaddup<Packet4f>(const float* from)
{
	Packet4f p = pload<Packet4f>(from);
	return vec_perm(p, p, p16uc_DUPLICATE32_HI);
}

template<>
EIGEN_STRONG_INLINE Packet4f
preverse(const Packet4f& a)
{
	return reinterpret_cast<Packet4f>(
		vec_perm(reinterpret_cast<Packet16uc>(a), reinterpret_cast<Packet16uc>(a), p16uc_REVERSE32));
}

template<>
EIGEN_STRONG_INLINE float
predux<Packet4f>(const Packet4f& a)
{
	Packet4f b, sum;
	b = vec_sld(a, a, 8);
	sum = padd<Packet4f>(a, b);
	b = vec_sld(sum, sum, 4);
	sum = padd<Packet4f>(sum, b);
	return pfirst(sum);
}

// Other reduction functions:
// mul
template<>
EIGEN_STRONG_INLINE float
predux_mul<Packet4f>(const Packet4f& a)
{
	Packet4f prod;
	prod = pmul(a, vec_sld(a, a, 8));
	return pfirst(pmul(prod, vec_sld(prod, prod, 4)));
}

// min
template<>
EIGEN_STRONG_INLINE float
predux_min<Packet4f>(const Packet4f& a)
{
	Packet4f b, res;
	b = pmin<Packet4f>(a, vec_sld(a, a, 8));
	res = pmin<Packet4f>(b, vec_sld(b, b, 4));
	return pfirst(res);
}

// max
template<>
EIGEN_STRONG_INLINE float
predux_max<Packet4f>(const Packet4f& a)
{
	Packet4f b, res;
	b = pmax<Packet4f>(a, vec_sld(a, a, 8));
	res = pmax<Packet4f>(b, vec_sld(b, b, 4));
	return pfirst(res);
}

EIGEN_DEVICE_FUNC inline void
ptranspose(PacketBlock<Packet4f, 4>& kernel)
{
	Packet4f t0 = vec_mergeh(kernel.packet[0], kernel.packet[2]);
	Packet4f t1 = vec_mergel(kernel.packet[0], kernel.packet[2]);
	Packet4f t2 = vec_mergeh(kernel.packet[1], kernel.packet[3]);
	Packet4f t3 = vec_mergel(kernel.packet[1], kernel.packet[3]);
	kernel.packet[0] = vec_mergeh(t0, t2);
	kernel.packet[1] = vec_mergel(t0, t2);
	kernel.packet[2] = vec_mergeh(t1, t3);
	kernel.packet[3] = vec_mergel(t1, t3);
}

template<>
EIGEN_STRONG_INLINE Packet4f
pblend(const Selector<4>& ifPacket, const Packet4f& thenPacket, const Packet4f& elsePacket)
{
	Packet4ui select = { ifPacket.select[0], ifPacket.select[1], ifPacket.select[2], ifPacket.select[3] };
	Packet4ui mask = vec_cmpeq(select, reinterpret_cast<Packet4ui>(p4i_ONE));
	return vec_sel(elsePacket, thenPacket, mask);
}

#endif

template<>
EIGEN_STRONG_INLINE void
prefetch<float>(const float* addr)
{
	EIGEN_ZVECTOR_PREFETCH(addr);
}
template<>
EIGEN_STRONG_INLINE Packet4f
ploadu<Packet4f>(const float* from)
{
	return pload<Packet4f>(from);
}
template<>
EIGEN_STRONG_INLINE void
pstoreu<float>(float* to, const Packet4f& from)
{
	pstore<float>(to, from);
}
template<>
EIGEN_STRONG_INLINE Packet4f
plset<Packet4f>(const float& a)
{
	return padd<Packet4f>(pset1<Packet4f>(a), p4f_COUNTDOWN);
}

} // end namespace internal

} // end namespace Eigen

#endif // EIGEN_PACKET_MATH_ZVECTOR_H
